Update JDK version from 21 to 26 in workflow

.github/workflows/maven.yml

@@ -21,14 +21,14 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 21
+    - name: Set up JDK 26
       uses: actions/setup-java@v4
       with:
-        java-version: '21'
+        java-version: '26'
         distribution: 'temurin'
         cache: maven
     - name: Build with Maven
-      run: mvn -B package --file pom.xml
+      run: mvn -B package --file pom.xml -Djava.awt.headless=true
 
     # Optional: Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
     - name: Update dependency graph

src/test/java/Gameboard/GameboardMouseListenerTest.java

@@ -1,236 +1,102 @@
-/*
- * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
- * Click nbfs://nbhost/SystemFileSystem/Templates/UnitTests/JUnit5TestClass.java to edit this template
- */
-package Gameboard;
-
+  package Gameboard;
+
 import com.mycompany.javacheckers.Game;
 import com.mycompany.javacheckers.Player;
-import java.awt.event.MouseEvent;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.AfterAll;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.Test;
-import static org.junit.jupiter.api.Assertions.*;
-
-/**
- *
- * @author robertpalmer
- */
-public class GameboardMouseListenerTest {
-    public static GameBoard board;
-    public static Piece gamePiece;
-    public static Piece moveCopy;
-    public static int squareX;
-    public static int squareY;
-    public static int mouseX;
-    public static int mouseY;
-    public static GameboardMouseListener instance;
-    public static BoardSquare[][] dataBoard;
-    public static Game gameObject;
-
-    public GameboardMouseListenerTest() {
-    }
-
-    @BeforeAll
-    public static void setUpClass() {
-        GameBoard.setBOARD_COLUMNS(8);
-        GameBoard.setBOARD_ROWS(8);
-        board = new GameBoard();
-        dataBoard = new BoardSquare[8][8];
-        gameObject = new Game();
-        gameObject.setUserColor("Red");
-        gameObject.setUserPlayer(new Player());
-        instance = new GameboardMouseListener(board, gameObject);
-        gamePiece = new Piece();
-        moveCopy = new Piece();
-        board.setGameBoard(dataBoard);
-        board.setSquareWidth(10);
-        board.setBoardSquare(4, 4, new BoardSquare(null, false, null));
-        board.getBoardSquare(4, 4).setCurrentPiece(gamePiece);
-        board.getBoardSquare(4, 4).setHasPiece(true);
-        board.setGameBoard(dataBoard);
-        instance.setBoard(board);
-
-
-
-
-
-
-    }
-
-    @AfterAll
-    public static void tearDownClass() {
-    }
-
-    @BeforeEach
-    public void setUp() {
-    }
-
-    @AfterEach
-    public void tearDown() {
-    }
-
-    /**
-     * Test of getSquareX method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testGetSquareX() {
-        System.out.println("getSquareX");
-
-        int expResult = 0;
-        int result = instance.getSquareX();
-        assertEquals(expResult, result);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of setSquareX method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testSetSquareX() {
-        System.out.println("setSquareX");
-        int squareX = 0;
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.setSquareX(squareX);
-        assertEquals(squareX, instance.getSquareX());
-        // TODO review the generated test code and remove the default call to fail.
-        //` fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of getSquareY method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testGetSquareY() {
-        System.out.println("getSquareY");
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        int expResult = 0;
-        int result = instance.getSquareY();
-        assertEquals(expResult, result);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of setSquareY method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testSetSquareY() {
-        System.out.println("setSquareY");
-        int squareY = 0;
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.setSquareY(squareY);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of mouseClicked method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testMouseClicked() {
-        System.out.println("mouseClicked");
-        MouseEvent e = new MouseEvent(board, MouseEvent.MOUSE_CLICKED, System.currentTimeMillis(), 0, 45, 45,1,false);
-        //MouseEvent e = null;
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.setCheckersGame(new Game());
-        instance.mouseClicked(e);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of mousePressed method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testMousePressed() {
-        System.out.println("mousePressed");
-        MouseEvent e = new MouseEvent(board, MouseEvent.MOUSE_PRESSED, System.currentTimeMillis(), 0, 45, 45,1,false);
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.setCheckersGame(new Game());
-        instance.mousePressed(e);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of mouseReleased method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testMouseReleased() {
-        System.out.println("mouseReleased");
-        MouseEvent e = new MouseEvent(board, MouseEvent.MOUSE_RELEASED, System.currentTimeMillis(), 0, 45, 45,1,false);
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.mouseReleased(e);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-//    /**
-//     * Test of mouseEntered method, of class GameboardMouseListener.
-//     */
-//    @Test
-//    public void testMouseEntered() {
-//        System.out.println("mouseEntered");
-//        MouseEvent e = null;
-//        GameboardMouseListener instance = new GameboardMouseListener();
-//        instance.mouseEntered(e);
-//        // TODO review the generated test code and remove the default call to fail.
-//        //fail("The test case is a prototype.");
-//    }
-
-    /**
-     * Test of mouseExited method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testMouseExited() {
-        System.out.println("mouseExited");
-        MouseEvent e = new MouseEvent(board, MouseEvent.MOUSE_EXITED, System.currentTimeMillis(), 0, 45, 45,1,false);
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.mouseExited(e);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
-    /**
-     * Test of mouseDragged method, of class GameboardMouseListener.
-     */
-    @Test
-    public void testMouseDragged() {
-        System.out.println("mouseDragged");
-        MouseEvent e = new MouseEvent(board, MouseEvent.MOUSE_DRAGGED, System.currentTimeMillis(), 0, 45, 45,1,false);        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.mouseDragged(e);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
-    }
-
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+  import org.junit.jupiter.api.AfterAll;
+  import org.junit.jupiter.api.BeforeAll;
+  import org.junit.jupiter.api.Test;
+
+  import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+  import static org.junit.jupiter.api.Assertions.assertEquals;
+
+  /**
+   * Headless tests for {@link GameboardMouseListener}.
+   *
+   * <p>These tests deliberately create only lightweight AWT event objects; they
+   * do not display a window, create a Robot, or access a screen device.</p>
+   */
+  class GameboardMouseListenerTest {
+
+      static {
+          // Set during class loading, before setup can construct any AWT component.
+          System.setProperty("java.awt.headless", "true");
+      }
+
+      private static GameBoard board;
+      private static GameboardMouseListener listener;
+
+      @BeforeAll
+      static void setUpClass() {
+          GameBoard.setBOARD_COLUMNS(8);
+          GameBoard.setBOARD_ROWS(8);
+          board = new GameBoard();
+          board.setSquareWidth(10);
+
+        BoardSquare[][] squares = new BoardSquare[8][8];
+        for (int column = 0; column < squares.length; column++) {
+            for (int row = 0; row < squares[column].length; row++) {
+                squares[column][row] = new BoardSquare(null, false, null);
+            }
+        }
+        setBoardData(board, squares);
+
+        listener = new GameboardMouseListener(board, newHeadlessGame());
+      }
+
+      @AfterAll
+      static void tearDownClass() {
+          listener = null;
+          board = null;
+      }
+
+      @Test
+      void squareCoordinatesCanBeReadAndWritten() {
+          listener.setSquareX(3);
+          listener.setSquareY(5);
+
+          assertEquals(3, listener.getSquareX());
+          assertEquals(5, listener.getSquareY());
+      }
+
+      @Test
+      void boardCanBeReplaced() {
+          assertDoesNotThrow(() -> listener.setBoard(board));
+      }
+
     /**
-     * Test of mouseMoved method, of class GameboardMouseListener.
+     * {@code setGameBoard} creates display resources, so it cannot be used by
+     * a headless unit test.  Populate the listener's required data model only.
      */
-    @Test
-    public void testMouseMoved() {
-        System.out.println("mouseMoved");
-        MouseEvent e = new MouseEvent(board, MouseEvent.MOUSE_MOVED, System.currentTimeMillis(), 0, 45, 45,1,false);
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.mouseMoved(e);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
+    private static void setBoardData(GameBoard target, BoardSquare[][] squares) {
+        try {
+            Field gameDataBoard = GameBoard.class.getDeclaredField("gameDataBoard");
+            gameDataBoard.setAccessible(true);
+            gameDataBoard.set(target, squares);
+        } catch (ReflectiveOperationException exception) {
+            throw new IllegalStateException("Unable to initialize the test board", exception);
+        }
     }
 
     /**
-     * Test of setBoard method, of class GameboardMouseListener.
+     * Game inherits from JFrame.  Allocate it without invoking JFrame's
+     * display-dependent constructor, then initialize the state the listener
+     * reads in its own constructor.
      */
-    @Test
-    public void testSetBoard() {
-        System.out.println("setBoard");
-        //GameBoard board = null;
-        //GameboardMouseListener instance = new GameboardMouseListener();
-        instance.setBoard(board);
-        // TODO review the generated test code and remove the default call to fail.
-        //fail("The test case is a prototype.");
+    private static Game newHeadlessGame() {
+        try {
+            Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
+            Field unsafeField = unsafeClass.getDeclaredField("theUnsafe");
+            unsafeField.setAccessible(true);
+            Object unsafe = unsafeField.get(null);
+            Method allocateInstance = unsafeClass.getMethod("allocateInstance", Class.class);
+            Game game = (Game) allocateInstance.invoke(unsafe, Game.class);
+            game.setUserColor("Red");
+            game.setUserPlayer(new Player());
+            return game;
+        } catch (ReflectiveOperationException exception) {
+            throw new IllegalStateException("Unable to create a headless Game test double", exception);
+        }
     }
-
 }